Regenerative furnace



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N. F. EGLER REGENERATI-VE FURNACE Fiied June so, 1923 a Sheets-Sheet s Mia/a5 fi derzbijgyZer Patented Jan. 26, 1926.

I To all whom it early concern nrcaonas r. sense; or cHIcAeo, rumors.

REGENERATIVE FURNACE.

Application filed June 30, 1923. Serial No. 648,808.

Be it known that I, NICHOLAS F. Eennn, a c1t1zen of the United States, residing at Chicage, 1n thev county of Cook and State of Ilhnois, haveinvented new and useful -'I1n provements in Regenerative Furnaces, of

which the following is a specification.

This invention relates to reversing regenerative open hearth furnaces and the like and is fully described invthe following specification and shown in the accompanying drawings in which:

Figure 1 is a longitudinal vertical section through one end of a furnace equigped with my invention, on the line 11 of ig. 3,

Flg. 2 is a similar view on the line 2-2 2 of Fig. 3, and

Fig. 3 is a horizontal section on theline 3-3 of Fig. 2.

The furnace of the embodiment shown comprises a furnace having a hearth 10 and roof 11 which communicates through a mixing port 12 and a passage 13 with a. slag pocket 14. The end ofthe furnace also communicates through an air port 15,-andone or more passages 16 with the slag pocket 17.

The slag pockets 14 and 17 communicate in a well known manner with regenerative chambers, (not shown), and these in turn through suitable valves communicate with the atmosphere, with the intake end of the furnace, and with a stack 011 the out end of the, furnace.

This furnace is intended particularly for fixed fuels such as natural gas, oils, powdered coal and the like which is introduced into the mixing port 12 through the opening 18. The air in the passage 13 is under'pres: sure which is controlled by the operator while that in the assage 16 is known as natural air, that IS drawn under the draft of the stack.

With this arrangement, the products of coanbustion on the out end of the furnace div1 e, the passages 16 and only a small part going out through the mixing port 12 and passage 13. to. the checker work which serves to preheat the air for this tpassage when the furnace is again, reverse For this reason the amount of heat introduced into this checker 1 work in the usual type of furnace is limited and when the passa 18 is again operated on the in end of the mace the pressure Inthe greater part going down through troduced into this passage is limited be- ,cause of the limited amount of heat which could be introduced into the checker work connected with this passage.

To remedy this defect, I have added one or more passages 19 as showm in Fig. 1 which communicate with the passages 16 through a cross passage 20. A valve 21 is placed in this cross passage which may be raised and lowered by means of a chain 22 passing over the pulley 23. Onthe in end of the furnace, the valves 21 are closed while the passage 13 is maintained under a considerable air pressure, that is, anything u to about two inches of water. The overhea air fed through the passages 16 is natural air as before.

On the out end of the furnace one or both of the valves 21 are raised so as to permit the products of combustion to pass through the passage 19, through the slag pocket 14; to the checker chamber to which it is connected. In this way a proper balance may be obtained between theheat of the checker chambers supplying the'passages 16.and 13, with the result that the air pressure in the mixing port 12 may be maintained to a much greater degree than has heretofore been possible. In this way the rate of combustion may be greatly increased. At the same time. the operator is able to exercise a much greater control over both the speed and klnd of combustion in the furnace all the time. The passages 19 may be made as large as necessa to contain-the necessary heat in the chec er chambers connected to the slag pocket l land the heat delivered thereto may be controlled by the amount of valves 21 are opened.

The cross passage or by-pass flue may be placed at any point from the out end of the furnaceitself to a position near the checker chambers or even between these chambers. The purpose of this by-pass is which the to maintain a balance between the temperature of the two checker chambers at each end of the furnace.

While I have shown and described ecu tain embodiments of my invention, it is to of the invention as disclosed 1n the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in view of the, prior artfi Iclaim v1. In a reversing regenerative open hearth furnace, a mixing port, an air port above the mixing port, a regenerative chamber communicating with each port,-- a passage leading, from each port to its regenerative chamber, a passage for introducing additional products of combustion from the furnace into the regenerative chamber for v the mixing port and means for closin the last named passage on the in-end of the.

furnace.

2. In a reversing regenerative open hearth furnace, a mixing port, an air port above the mixing port, a regenerative chamber communicating with each port, a passage leading from each port to its regenerative chamber, a passage for introducing additional products of combustion from the furnace into the regenerative chamber for the mixing port, and means for closing the intone i last named paeeage on the in-end at the furnace. 1

3. In a reversing regenerative open hearth furnace, a central mixing port, an air port on each side of the mixing port, a regenerative chamber communicatlng with said mixing port, a regenerative chamber communicating with said air orts, a passage leading from each port to its regenerative chamher, a separate passage adjacent each passage leading to the air port, a cross passage connecting the last named passages, and a valve in each cross passage.

4. In a reversing regenerative open hearth furnace, a mixing port, an air port above the mixing port, a regenerative chamber communicating with each port, a passage leading from each port to its regenerative chamber, a passage for introducing additional products of combustion from the air port into the regenerative chamber for the mix ing port, and means for closing the last named passage on the in-end of the furnace.

NICHQLAS F. EGLER. 

